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ergosterol

[ur-gos-tuh-rohl, -rawl] /ɜrˈgɒs təˌroʊl, -rɔl/
noun, Biochemistry
1.
a colorless, crystalline, water-insoluble sterol, C 28 H 43 OH, that occurs in ergot and yeast and that, when irradiated with ultraviolet light, is converted to vitamin D.
Origin
1885-1890
1885-90; ergo-2 + sterol
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for ergo-sterol

ergosterol

/ɜːˈɡɒstəˌrɒl/
noun
1.
a plant sterol that is converted into vitamin D by the action of ultraviolet radiation. Formula: C28H43OH
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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ergo-sterol in Medicine

ergosterol er·gos·ter·ol (ûr-gŏs'tə-rôl', -rōl')
n.
A crystalline sterol synthesized by yeast from sugars or derived from ergot and converted to vitamin D2 when exposed to ultraviolet radiation.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Article for ergo-sterol

ergosterol

a white crystalline organic solid of the molecular formula C28H44O belonging to the steroid family. It is found only in fungi (e.g, Saccharomyces and other yeasts and Claviceps purpurea, the cause of ergot, a fungal disease of cereal grasses) and is chemically related to cholesterol. Ergosterol is converted by ultraviolet irradiation into ergocalciferol, or vitamin D2, a nutritional factor that promotes proper bone development in humans and other mammals.

Learn more about ergosterol with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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